Firefox 121.x — End of Life
EOLFirefox 121.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 121 | Dec 19, 2023 | — | Jan 23, 2024 | 121.0.1 | EOL |
CVEs affecting Firefox 121.x (0)
Firefox 121.x is EOL — migrate to Firefox 122.x
Firefox 122.x is the next major release. Plan your upgrade before Firefox 121.x stops receiving security patches.
Frequently asked questions
Is Firefox 121 end of life?
Yes. All Firefox 121.x releases have reached end of life and no longer receive security patches. Migrate to Firefox 122.x as soon as possible.
What CVEs affect Firefox 121?
No CVEs are currently tracked for Firefox 121.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 121 version?
The latest Firefox 121.x patch release is 121.0.1, released on January 9, 2024. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 121 to Firefox 122?
To migrate from Firefox 121 to Firefox 122: (1) review the official Firefox 122 migration guide for breaking changes, (2) update dependencies and configuration accordingly, (3) test thoroughly in a staging environment, (4) deploy with a rollback plan. Starting early gives you time to resolve compatibility issues before your current version reaches end of life.
Is it safe to run Firefox 121 in production?
No. Firefox 121 has reached end of life and security vulnerabilities are no longer patched. Upgrade to a supported version immediately.
Data sourced from endoflife.date · CVE data from NVD · EPSS from FIRST.org · KEV from CISA